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Biology Worksheet

🧩 Genetics & DNA MCQ Practice Recap

Chapter: Genetics & DNA · Level ★★★ · Time: 25 min
SCORE___ / 20
NameClassDate
After this worksheet you can
Recall replication factsRecall inheritance ratiosRecall blood group geneticsRecall sex-linked inheritance
📚 Quick Recap

🎯 What you'll practice: A written recap of the 12-question Genetics & DNA MCQ Practice.

🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4

1Chargaff's rule states:
2Which enzyme unwinds DNA?
3Dihybrid cross phenotype ratio:
4Which molecule carries the code from DNA to the ribosome?

🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11

5Okazaki fragments form on the strand.
6Blood type AB is an example of .
7What genotype gives Type A blood?
8Explain incomplete dominance with the red/white/pink flower example.
9Why is colour blindness more common in males than females?

🚀 Section C · Challenge ● CHALLENGE 5

10Explain the key difference between codominance and incomplete dominance, using blood type AB and pink flowers as your two examples.
💭 Reflection — the most useful thing I learned:
A ___/4   B ___/11   C ___/5   Total ___/20 Teacher's Signature Parent's Signature
✂ answer key — fold or cut before handing out

1-B   2-C   3-C   4-B  |  5 = lagging   6 = codominance   7 = IAIA or IAi   8 = neither the red nor white allele fully masks the other, so the heterozygote blends into an intermediate pink phenotype   9 = because the recessive allele is on the X chromosome; males (XY) need only one copy to show the trait, while females (XX) need two copies, making them far more likely to just be unaffected carriers  |  10 = In codominance (blood type AB), both alleles are fully and simultaneously expressed side by side — the phenotype shows both A and B antigens distinctly, not a blend; in incomplete dominance (pink flowers), neither allele is fully expressed and the phenotype is a genuine blend or intermediate of the two — you see one merged trait (pink) rather than two separate traits shown together.

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